Wetting agents, their primary benefit is that they help keep the water in contact with all the surface in
the cylinder and head assembly, I've seen testing done and it reduces head and cylinder hotspots.
Even if your heating the overall engine up this reduces the chances of a area fatiguing and giving up on you.
Like between the spark plug and valve guides...

I'm still interested in trying waterless coolant in my 950. I like the idea of zero pressure in the cooling system..